Construction method for asymmetric triple arch tunnel with extra-large section

The invention relates to the technical field of triple-arch tunnel construction, in particular to a construction method for an asymmetric triple-arch tunnel with an extra-large section, which comprises the following steps: step 1, constructing a middle hole (1) of the triple-arch tunnel; 2, after the main body structure of the middle partition wall (4) of the middle hole is constructed and 75% of the design strength is achieved, a right hole (2) on one side of the middle hole (1) is constructed, and a secondary lining (5) of the right hole is completed; 3, after the right hole secondary lining (5) is completed, a left hole (3) on the other side of the middle hole (1) is constructed, and a left hole secondary lining (6) is completed; the middle hole (1), the right hole (2) and the left hole (3) are sequentially connected to form the triple-arch tunnel. According to the triple-arch tunnel construction method, the construction cost can be effectively reduced, the construction progress is accelerated, the quality